[Retracted] Biomechanical Analysis of Different Internal Fixation Combined with Different Bone Grafting for Unstable Thoracolumbar Fractures in the Elderly

Table 1

Model material properties.

	Possion’s ratio (μ)	Young’s modulus (MPa)	Material model
Compact bone	0.3	12000	Anisotropy
Cancellous bone	0.2	100	Isotropy
Fiber ring	0.45	92	Isotropy
Nucleus pulposus	0.499	1.0	Viscoelasticity
Annulus matrix	0.51	3.36	Isotropy